Kavli Affiliate: Ke Wang
| First 5 Authors: Ke Wang, Ke Wang, , ,
| Summary:
Based on the magnetic reconnection mechanism, this study investigates how to
extract energy effectively from an accelerating Kerr black hole in the plunging
region and circular orbit region. After introducing the properties of
accelerating black holes, including the event horizon, ergosphere, circular
orbits, and innermost stable circular orbit, we investigate the magnetic
reconnection process in the plunging region. Specifically, we analyze
variations of the azimuthal angle with respect to the acceleration, examine
changes in energy per enthalpy of decelerated plasma, and plot energy
extraction efficiency along with permissible energy extraction regions. Results
show that in the plunging region, at larger radii of reconnection locations,
the accelerating black hole exhibits higher energy extraction efficiency than a
Kerr black hole. Away from extremality, the acceleration parameter impedes
energy extraction, while near extremality, it enhances extraction. We also
study energy extraction in circular orbit region by plotting energy extraction
efficiency within permissible regions. We find that the permissible energy
extraction area is reduced and the efficiency exceeds that of Kerr black holes
due to the existence of acceleration parameter. Larger acceleration parameters
yield more effective energy extraction regardless of extremality, which is
different from that in the plunging region. Additionally, energy extraction
efficiency in the plunging region surpasses that in the circular orbit region,
aligning with prior conclusions.
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